> ANY antenna above ground, has multiple lobes.
> You can simulate this with any program like MMANA or EZNEC...
> <http://www.qrz.ru/schemes/contribute/arrl/chap3.pdf>
Yes, and that is my point too.
To get the good gain at medium elevations from an omni, one need a large
ground plane (screen, not radials) going out several wavelengths in all
directions. In my emails I talk about being over a metal roof or large
chicken wire ground plane to properly hide the real ground reflections and
to block energy going down (which lose 3 dB) and hence all those high
angle nulls.
Bob, WB4APR
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Roland
Zurmely via AMSAT-BB
Sent: Wednesday, March 16, 2016 6:30 PM
To: AMSAT
Subject: [amsat-bb] 4 omni antennas plots (nulls)
Hi Bob WB4APR,
ANY antenna above ground, has multiple lobes.You can simulate this with
any program like MMANA or EZNEC...
<http://www.qrz.ru/schemes/contribute/arrl/chap3.pdf>
73 de Roland PY4ZBZ
_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available to
all interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb